I need help with placing a window in a wall that doesn't touch the floor level.
All the pink figure in the following picture is one room obtained by merging several rooms from different levels.
When level 1 is active, the window probably is not placed because the wall originally comes from level 2.
When level 2 is active, the window probably is not placed because the chosen room is from different level (1).
Tried all possible still heights.
How can I place it in this situation?